Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d2cd7a69098f161…

MALICIOUS

PDF

85.5 KB Created: 2021-09-24 10:06:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 21c9194129ac5603ac7cbc4636ab7d26 SHA-1: 902b8d0f60e47412e82f16ba77d320079f3488e8 SHA-256: 9d2cd7a69098f16169f5b1e3051df10b9b51fafcd27876acb7574d8cfab979ef
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external URLs hosted on disposable domains, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://smidgel.ru/uplcv?utm_term=mi+max+2+miui+12+update PDF link annotation
    • http://criminisiepartners.it/userfiles/files/wubelesomanifoxofi.pdfIn PDF document text
    • http://artattack-concerts.de/files/file/27082898215.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/61263255508.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/zegep.pdfIn PDF document text
    • http://vegman-kzn.com/ckfinder/userfiles/files/vuxetorosiwejunut.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/tukanupadetikitugebinepe.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/1848614164.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210924113205.pdfIn PDF document text
    • https://e-room.co/userfiles/file/polomumefuzelup.pdfIn PDF document text
    • http://rydelko.eu/userfiles/file/16245125191.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/39899759468.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/pitobironutesobesekawev.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/zapamegixumimerefunosa.pdfIn PDF document text
    • https://www.mppoa.cloudlinesystems.com/assets/ckfinder/userfiles/files/20379837561.pdfIn PDF document text
    • https://coluer.ir/documents/file/68796341282.pdfIn PDF document text
    • https://hocaukhudothithanhphogiaoluu.com/asset/site/files/30087967299.pdfIn PDF document text
    • http://skyrun-arser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/2109231211237244345lhph5.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/55610500052.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613980cfa1ea1---24164404939.pdfIn PDF document text
    • https://spacio.hk/attachment/file/58074936022.pdfIn PDF document text
    • https://rippa.pt/files/file/29944606838.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/mipoximurakomuf.pdfIn PDF document text
    • http://www.focitabor.hu/userfiles/file/64602047934.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/vabevepivowuvadulewipuv.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE592 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fda4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA4 19552 bytes
SHA-256: 8637f1449190b7d7aab8069715352fd44f74aa3bea5f64f4c4fbff23dc012a27
font_02_sfnt_off00013132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13132 10384 bytes
SHA-256: 835b3da512e567deb3f43c57a66008a814d65d505ff83d086f2b4cbe45aeb8d9

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